Worked on the koreader/koreader repository, focusing on backend and API development using Lua. Addressed a critical issue in the WebDAV implementation by refining the logic for directory listing, specifically correcting how folders with names matching the current directory were displayed. The solution involved updating the directory path comparison to use the full item path, which ensured that directory listings were both complete and accurate for users. This bug fix improved the reliability of file management within the application, directly enhancing user experience. The work demonstrated attention to detail in backend logic and a strong understanding of API behavior and file system operations.